fix file completion

Author: kiddos

src/file.rs

@@ -23,14 +23,18 @@ pub fn list_all_file_items(path: &Path) -> Vec<String> {
 const MAX_LINE_LENGTH: usize = 600;
 
 pub fn get_file_items(current_line: &str, root_folder: &str) -> Vec<(String, usize)> {
-    if current_line.len() >= MAX_LINE_LENGTH {
+    if current_line.len() > MAX_LINE_LENGTH {
         return Vec::new();
     }
 
+    let indices: Vec<usize> = current_line.char_indices().map(|(i, _)| i).collect();
     let mut file_items = Vec::new();
     for (j, _) in current_line.char_indices().filter(|&(_, ch)| ch == '/' || ch == '\\') {
-        for i in 0..j {
-            let p = &current_line[i..j];
+        for &i in indices.iter() {
+            if i > j {
+                continue;
+            }
+            let p = &current_line[i..j+1];
 
             for base in [root_folder, ""].iter().map(PathBuf::from) {
                 let path = base.join(p);